Question

Noopur needs a lens of power - 4.5 D for correction of her vision.
1) what kind of defect in vision is she suffering from?
2) what is the focal length and nature of the corrective lens?
3) draw ray diagram showing the
a) defected eye and
b)correction for this defect
4)what are the causes of this defect

Answer 1

Answer:

noopur is suffering from myopia eye defect

suffering person should use concave lens

Answer 2

Answer:

Explanation:P= -4.5diopter

(a)what kind of defect in vision is she is suffering from :

The person is suffering from Myopia where he can see near distance clearly but finds difficulty in seeing distant objects.

(b)what is the focal length and nature of the corrective lens:

We know that P=1/f

P= - 1/4.5

=-0.222m

=-22.2cm

so minus sign indicates it is concave lens .

c]draw a diagram showing the defec and correction for this defect. :

Please refer the attachment.

d]what are the causes of this defect Myopia:

Causes are :

--> Elongated eye ball

---> Greater focal length.